body{font-family:'微软雅黑';}
table{border-collapse:collapse;}
th,td{border:1px solid black;}
h1,h2,h3,h4,h5,h6{text-align:center;}
.bg0{background:#45FFFF;}
.bg1{background:gray;}
.bg2{background:silver;}
.bg3{background:greenyellow;}
.center{margin:auto;}